Telephone ringer



June 1, 1943. A. w. VINCENT TELEPHONE RINGER Filed Sept. 8, 1941 INVENTOR.

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ATTORNEY.

Patented June 1, 1943 TELEPHONE- RINGER Andrew W. Vincent, Rochester, N. Y.,-assignor to Stromberg-Carlson Telephone Manufacturing Company, Rochester, N. 1Y., a corporation of New York Application September 8, 1-941; Serial-No. 409,918

4 Claims.

This invention relates to ringers and more particularly to tuned ringers for use in telephone systems.

The purpose of thepresent invention is to provide a ringer of improved constructionwhich will be simple to manufacture, which can 'be'quickly and accurately tuned to a desired frequency; and which will be relatively free from failures during service.

The various features and advantages of the invention will appear from the detailed description. and claims when taken with the drawing in which:

- Figs. 1, 2 and 3 are respectively, a front elevationfa side elevation, and a bottom view of the present ringer; and

Fig, 4. is a detailed view partially in section showing especially the novel arrangement for mounting the tuning reed and the armature in the ringer assembly. g

In the drawing, thenumeral 5 designates-a pair of ringer coils, supported in spaced parallel relation by having one end of the core 6 of each coil secured to the yoke I by any suitable means such as by screws 8. .The yoke includes an upright portion 9 on which there are mounted a pair of adjustable supporting arms l0. In the arrangement shown, each arm is mountedfor rotary adjustment on a pivot I2, riveted in an opening in the upright 9. The lower end of each arm I0 is provided with .aslot 13 to receive a clamping screw I4 which engages a tapped opening in the upright 9. The head of. this clamping screw engages the lower end of the related-arm Hi to lock it in its adjusted position. Each adjustable arm carries a right angular post 15 on the free end of which a gong I1 is mounted. It will be seen that there are a pair of spaced'gongs mounted for adjustment toward and-away from each other by means of the arms Hi just referred to.

The lower ends of the cores 6 extend beyond their related coils 5, as threaded extensions which support a U-shaped bracket of nonmagnetic material, such as brass. This bracket has a main portion l8a extending perpendicular to the cores 6, which portion is provided with two upright arms lab. As herein illustrated, the main portion l8a of the bracket has spaced openings therein thru which the threaded extensions of the cores 6 project. Each extension has an adjusting nut IS in threaded engagement therewith at each surface of the portion l8a of the bracket. Thus by adjusting the pairs of nuts on the threaded extensions of the cores 6, the bracket may be moved to'positionxthe armature 2i .carriedthereby, nearer to .or'farther from the ends of the cores ceive clamping nuts 22. As viewed in Fig. 2, the

left hand arm 18b of the bracket is clamped between the nut 22 and the shoulder on the bar 2|, while the right-hand bracket arm lilb as well as the lower end'of' the permanent magnet 24 are clamped between the nut 22. and the right-hand shoulder on the bar. The upper end of the magnet 24 is secured by a screw to a lug 25 (Fig. 1) struck out from the yoke, thereby completing the magnetic .circuit.

Thebar 2| provides a novel mounting for the tuned-reed 26which isa flat spring-like strip of metal. This reed has one of its ends attached to the nbarat one side 'of the vertical axis of sym'- metry of the ringer and has its other end attached to the previously mentioned armature 231 at a point on the other side of said axis, said points ofatta-chment being relatively close together and adjacent theintermediate portion of said armature-(see-Fig. 4). The respective end portions of the armature are thus supported in operative relation to the lower ends of the cores 6, with a suitable space normally existing between the armature and the core ends. At an intermediate point on the armature 2i! there is mounted a rod 28 carrying at its upper end a clapper 29. This rod 'extends at right angles to the armature through an opening in the bracket i8 (Fig. 1) and in they space between the two coils 5 with the clapper adjacent the gongs ll. As herein illustrated themounting of the rod on the armature includes a cylindrical piece'lifl having a reduced end portion riveted in an aperture at an intermediate part of the armature 2B. The other end of the cylindrical piece is drilled so that the lower end oi the rod 28 can be driven therein with a tight fit.

This novel mounting causes the reed to extend in a-plane with its principal axis parallel to that of the armature and permits the reed to flex about an axis extending at right angles to the length of the armature. This enables the reed to have substantial width thereby tending to reduce the strain on the reed to a small amount per unit area with the result that there are fewer reed failures during service. In this mounting, the end of the reed 26 which is secured to the armature is clamped between the rectangular blocks 3| by screws 32 passing through the blocks as well as through the reed and into the tapped openings in the armature 23. The side edges of the blocks 3| can be carefully machined to grip the reed accurately and thereby accurately determine its effective length. The other end of the reed is clamped between a block 33 and a flat surface of the bar, the clamping screws 34 passing through openings in the block and the reed 26 to engage tapped openings in the bar 2|. The use of clamping screws 32 and 34 insure a moreuniform clamping of the reeds 26 than is possible by the use of rivets since no two operators peen over a rivet the same amount. It will be noted from Fig. 4 that one portion of the bar 21 is cut away as in-' dicated at 20a to afford clearance for the vibrating reed. In this instance also, the surfaces of the block 33 and of the bar surface 20a may be machined so that the clamping area between these parts may be accurately determined and thus the efiective length of the reed can be accurately established thereby enabling the ringer to be accurately tuned.

What I claim is:

1. In a ringer, a yoke, at least one bell carried by said yoke, a pair of coils having cores supported at two of their ends on said yoke in spaced parallel relation, 9, fixed support adjacent the other ends of said cores, an elongated armature extending in a direction generally at right angles to the long axis of said cores with one end of said armature cooperating with one core end and the other armature end cooperating with another core end at said other ends of said cores whereby said armature ends can rock with respect thereto, a clapper in operative relation to said bell, said clapper being operated by said armature, means for mounting said armature in the position mentioned including a flexible reed-like strip extending lengthwise of said armature and in spaced parallel relation thereto and having an effective lengthsubstantially less than the distance between said cores, said strip having one end secured to said support and its other end secured to said armature, said reed being mounted to flex about an axis located adjacent the mid-portion of said armature and extending at right angles to the long dimension of said armature, and a magnet extending between said yoke and said armature to complete a portion of the magnetic circuit of said ringer.

2. In a ringer, a yoke, at least one bell carried by said yoke, a pair of coils having cores supported at two of their ends on said yoke in spaced paral lel relation, a fixed support adjacent the other ends of said cores, an elongated armature extending in a direction generally at right angles to the long axis of said cores with one end of said armature cooperating with one core end and the other armature end cooperating with another core end at said other ends of said cores whereby said armature ends can rock with respect thereto, a clapper in operative relation to said bell, said clapper being operated by said armature, means for mounting said armature in the position mentioned including a flexible reed-like strip extending lengthwise of said armature and in spaced parallel relation thereto and having an effective length substantially less than the distance between said cores, said strip having one end secured to said support and its other end secured to said armature, said reed being supported within the projection of said armature to flex about an axis located adjacent the mid-portion of said armature and at right angles to the greatest dimension thereof, and a magnet extending between said yoke and said armature to complete a portion of the magnetic circuit of said ringer.

3. In a ringer, a yoke, at least one bell carried by said yoke, a pair of coils having cores supported at two of their ends on said yoke in spaced for mounting said armature in the position mentioned including a flexible reed-like strip extending lengthwise of said armature and in spaced parallel relation thereto and having an efiective length substantially less than the distance between said cores, said strip having one end secured to said support and its other end secured to said armature, said reed being approximately equal in width to the width of the armature and flexing about an axis located adjacent the midportion of said armature and at right angles to the greatest dimension thereof, and a magnet extending between said yoke and said armature to complete a portion of the magnetic circuit of said ringer.

4. In a ringer, a yoke, at least one bell carried by said yoke, a pair of coils having cores supported at two of their ends on said yoke in spaced parallel relation, a fixed support adjacent the other ends of said cores, an elongated armature extending in a direction generally at right angles to the long axis of said cores with one end of said armature cooperating with one core end and the other armature end cooperating with another core end at said other ends of said cores whereby said armature ends can rock with respect thereto, a clapper in operative relation to said bell, said clapper being operated by said armature, means for mounting said armature in the position mentioned including a flexible reed-like strip having one end secured to said support and its other end secured to said armature and extending lengthwise of said armature, said means also including spaced clamping members extending across said reed near the intermediate portion of said armature and screw threaded elements passing thru said members respectively into said support and into said armature for clamping the ends of said reed respectively to said armature and to said support, and a magnet extending between said yoke and said armature to complete a portion of the magnetic circuit of said ringer.

ANDREW W. VINCENT.- 

